Optical surface production

  Optical surface production

See also mirrors for space instrumentation within the « space equipment » chapter.


ATS primary mirror
Amos has been awarded the complete design and manufacture of the ATS (Auxiliary Telescope System) which includes the telescope optics (Ritchey-Chrétien combination) with a ZERODUR lightweight hyperbolic primary mirror of 1.8 m diameter, passively mounted. Main characteristics are:

• Substrate: ZERODUR
• Diameter: 1870 mm ; edge thickness: 200 mm
• Radius of curvature: 5400.3  0.1 mm
• Conic constant: -1.00061  9.8 10 –5
• Lightweighting factor: 56 % (machined out of mass; semi-closed back structure)
• Axial supporting: whiffle tree (54 points)
• Radial supporting: 16 astatic levers and 1 central ring
• Measured wavefront error in the cell: 39 nm RMS

ATS secondary mirror
Final optical quality = 15 nm RMS WFE

ATS tertiary mirror
Final optical quality = 15 nm RMS WFE

Aluminium mirror
As part of the PLANCK Primary Reflector test bench, AMOS supplied to CSL a convex spherical mirror made of 5083 aluminium alloy.

(diameter 1520 mm; surface form error better than 1 m rms)

 

SiC experience
Silicon carbide is a hard material with the best combination of mechanical and thermal properties and hence is an ideal mirror substrate candidate.

AMOS has developed an in-house know-how in silicon carbide polishing and figuring.
This know how has been applied for different projects : GAIA, Sentinel 2 and the MAST ground-based solar telescope.




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 ON FOCUS - Diamond Turning

Advanced Mechanical and Optical Systems (AMOS) manufactures small optical pieces by diamond turning mainly for infrared applications but also, after post polishing, for visible or ultraviolet. Concave or convex mirrors up to 500mm can be machined with extreme asphericities....
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 LASTNEWS

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